Use ComWrappers in some Marshal unit-tests and update platform metadata #56595

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AaronRobinsonMSFT merged 11 commits intodotnet:mainfrom

AaronRobinsonMSFT:runtime_56474

Aug 3, 2021

Commits on Jul 29, 2021

Remove the SupportedOSPlatform attribute from the ComWrappers API.
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Commits on Jul 31, 2021

Merge remote-tracking branch 'upstream/main' into runtime_56474
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Commits on Aug 2, 2021

Commits on Aug 3, 2021

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